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Finding the Fourth Proportional to 1,281.84, 1,765.38 and 1,191.12

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Solution

The fourth proportional to 1,281.84, 1,765.38 and 1,191.12 is: 1,640.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.84 : 1,765.38 = 1,191.12 : x
  2. Step 2: Convert to fraction form
    1,281.84/1,765.38 = 1,191.12/x
  3. Step 3: Cross multiply
    1,281.84x = 1,765.38 × 1,191.12
  4. Step 4: Simplify right side
    1,281.84x = 2,102,779.43
  5. Step 5: Solve for x
    x = 2,102,779.43/1,281.84
  6. Step 6: Final answer
    x = 1,640.44

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.